{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Disease", "Chemical"], "input": "In recent years , increasing evidence has suggested that the messenger molecule nitric oxide ( NO ) is involved in pain mechanisms of migraine without aura ."}
{"Disease": ["pain", "migraine without aura"], "Chemical": ["nitric oxide", "NO"]}